Grow-out of mud crab crablets, Scylla paramamosain in brackishwater pond with different feeding strategy

Abstract

This research aimed to know the crablet growth and survival rate after cultured in brackishwater pond with different feeding strategy. Nine ponds fenced by black plastic net, each size of 100 m2 and pond water level at 60-80 cm. Crablets (weight size of 1.51+0,15 g/ind) from hatchery stocked at the density of 1 ind./ m2. Chopped trash fish at biomas 3-5% was given to the crablets as feed at every day (A), at every two days (B) and at every three days (C). Each treatment in three replications. At the three months of culture the highest final weight (128.23+21.19 g/ind.) in treatment A, then treatment C (107.04+25.24 g/ind.) and treatment B (95.60+5.79 g/ind.). Treatment A with the highest daily growth rate (1.41+0.1 g/day) and significantly different (P<0.05) with the daily growth rate in treatment B (1.04 +0.06 g/day) and treatment C (1.17+0.09 g/day). The highest survival rate (39.7%) after four months cultured was obtained in treatment B. High salinity attained to 54 ppt in the end of third month of culture was caused the high numbers of mud crab mortality in all treatments.